L-Sistein Derişimine Bağlı ?-Zn(OH)2 Oluşumu ve Kalsinasyon Ürünleri Olarak Farklı Morfolojideki ZnO Yapıları

Abstract

Structural characterization of the precipitation products of zinc nitrate and sodium hydroxide obtained using L-cysteine additive was carried out. XRD analysis showed that -Zn(OH)2 crystal structure formed in the synthesis condition where L-cysteine:zinc molar ratio was 0.165:1. Plate-like morphology, was oberved in the SEM micrograph of this sample. No crystal structure was apparent upon increasing L-cysteine:zinc ratio ten fold. L-cysteine contents of the samples synthesized at low and high L-cysteine:zinc ratios were calculated as 6.0 % and 38.4 %, respectively. Calcination of both samples at 700 o C for 2 hours yielded formation of ZnO. In the UV-Vis spectra of the ZnO samples two peaks were observed at 329 nm and 381 nm. Crystal defects of these samples were determined via PL spectroscopy.